I recently purchased this TankDrum from "tankdrum.com" and have been having tons of fun playing with it. These tankdrum's are created out of propane tanks and each note is tuned to a specific key so there are no 'wrong' notes. The tankdrum is a solution based on the "hang drum" which is very hard and expensive to obtain, it also is a similar idea as a steel drum you would hear in the islands but these are played by hand. The propane tankdrum has an amazing metallic percussion sound and the individual notes ring out in soothing tones. This is a great instrument to get others involved in music since it is relaxing, fun to play, and requires very little 'practice' or 'learning' to make some great sounds! If you are interested, go check out all the models and demos at http://www.tankdrum.com and tell them Brainphreak sent ya! :P You can even buy multiple drums with complimentary keys so together you can make even more amazing sound combinations.
I find myself playing the tankdrum just before bedtime and it is a nice relaxing way to wind down after a long day. Below is a sample I recorded on my wedding day improvising shortly after I received this amazing instrument. Technically this drum in the video is an A7 tuned model with only 7 notes including an A in the middle spot. Ignore all the weird faces I may be making and listen to the sounds this thing can make! I have since ordered another one that is double sided... a B17! (17 notes)